Hot-blast regulator



(No Model.) I

' F. W. GORDON.

Hot Blast Regulator.

' No. 239,325. Patented March. 29, 1881'.

1 I W A v d WITNESSES: SHdULbC/K- ZNVENTOR e Z Y.

N4 FETERS, PHOTO-LITHOGRAPHER, WASHINGTON, D c.

UNITED STATES PATENT OFFICE.

FREDERICK W. GORDON, OF PITTSBURG, PENNSYLVANIA.

HOT- BLAST REGULATO R.

SPECIFICATION forming part of Letters Patent No. 239,325, dated March29, 1881. Application filed August 2A7, 1880. (No model.)

In Figure 1, cold air forced into pipe H is heated by passage throughthe stoves and reaches the furnace in a heated state.

F O is a pipe leading from cold-air pipe H to the hot-air pipes--A A B.This pipe contains a controlling-valve, E, which may be set to admitmore or less cold air to the hot-air pipes. Such an arrangement ofparts, the valve E being a common valve to be controlled by hand, is notnew. By admitting cold air through the pipeF (J the temperature of theair entering thefiirnace can be, by continual skillful manipulation ofthe valve E, maintained at anydesired point below the maximum capacityof the heating apparatus. I arrange the valve E so as to cause it to actautomatically. I find by experiment that an increase of temperature inthe stove causes a reduction of pressure inthe stove-outlets, and adecrease of temperature causes an increase of pressure.

Fig. 2 shows the form of valve I use at E in Fig. 1. I is the valve,having its stem attached to diaphragm J and to lever K. Above thediaphragm is a chamber in which the heated air brought from pipe Athrough pipe D acts with a practically static force, as there ispractically no flow or motion of the air. Pipe F (J, which contains thevalve, is a conduit containing moving air.

Weights upon the lever K may be adjusted so as to hold valve I slightlyopen. An increase of heatin a stove reduces the pressure in the pipe A,and consequently in the chamber above the diaphragm. The valve Will thenopen Wider and admit cold air past it. duction of teinperatu re andincrease of pressure in pipe A tends to close the valve.

A piston may take the place of the diaphragm J, and any other form ofWeight-adjust ment may take the place of the lever and weightsshown. Aspring will answer as the weight'adjusting element. The diaphragm issimply a pressure-surface subjected on one side to the pressure ofmoving air, when the valve is in any degree open, and on the other sideto the pressure of air from the hot air pipe. The pipe F G is really adirect pipe between cold-air pipe and hot-air pipe.

' I claim asmy invention- In hot-blast regulators, the combination, withan air-heater having an admission-conduit and a discharge-conduit, aconnectingconduit between said admission and discharge conduits, and avalve in said connecting-conduit, ofa means for adjusting the weightupon said valve, a pressure-surface opposed to the opening ofsaid valve,and an independent conduit connecting said pressure-surface with saiddischarge-conduit, substantially as setforth.

FRED. IV. GORDON.

Witnesses:

JAMES A. MoKEAN, V. V. STRoBEL.

A re-,

